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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6db608dca569d6ee304dd5b02ff58c178ea296484f8ecb45b37624ae95f50f' 
  AND token = 'yoG0E3aYXk0Wbhp+jY8wA0jbpR8Pr1idVTuqFqwX7Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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