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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b826926d56129cf89b4f0236c60ae52a8a5d53cd3b4871c22ff5c332319690c6' 
  AND token = 'EkbNRd0gUUlpSCrhez9CKB3KpBGdDNdP11OO6TwlUcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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