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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f9b19c1d69eee92932ce7365b3d935310cf51c474731c70083d04c4aace35e' 
  AND token = '2p52JrdqF4Pz4F0f3t3rcXGT8JBKEExpTFjBwDOUsmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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