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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0262b69e5f8325345a0410f3d6399659c9869c675ce7629cd5d7d2a96441ca' 
  AND token = 'pnMQd5ReiN6uadNHiash2MODFqH2ZA1l6GCkdR2YzFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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