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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112092bf97e039569d092e197792eadb4d213cb3fcd3c94484dbd878a619ce85' 
  AND token = 'Pktbw2JJvZzGfeNyUatK0fXnDIEtI2x/XJEW0i7ZzZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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