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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b5aa535a7f19929cb55c5077ac0b6e5fb3bfe79cf58b413d59713aece0f2f3' 
  AND token = 'CTls68PAJx8cZ34xWGdZcGY/YKynULay8naMZOjQ+5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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