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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77462dba237f949f70323660c7828e176f6761a0d1046b80cc1fcbc4754e29a0' 
  AND token = 'pdooeBg1cFbmI0q+/TyIR1BiSfpTtC2jbPxoqojGeps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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