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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a891ac42be81864c17231f0f7a61e327c0f603293af77a07b999e9f2aa6305' 
  AND token = 'ecx4aBSye7XXT3mUN2ORFHLHn30T/OhhiZk8ceOWSyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}