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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5325bcf9e949e7f96cfb79f5a629a08b35db47938509d7cf9dfdc9ed4cd5c862' 
  AND token = '0p2Ze13RfX3DuYuBrCfq4GOlM58KIo8yYarjtYAckVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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