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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c05b6c00ab24af2ad6938ce08c4cfff7abb37279bd334a64ce70a10b57dd40' 
  AND token = 'PxYRPR5WcAUQ6H2QPTdraQAyr35NqCmMaui4GGHDWlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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