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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44e2d109dd06515986368c3303ce588947b27f06a8a4ef176da83f04b87a531' 
  AND token = 'pqYbwe9x8wQ8N2q5qapPDxuJZ7SihHxTFVdWAzydtXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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