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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85ec21dbe832551b278e523f86c432db3d997989f87fba64dc85973cc6866c9' 
  AND token = 'TUJYcoq4buO/2eYgPaw+JES0cuUuBzr0h6lke6xy69M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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