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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5b83048003b28a109ba73a5e2791ff6de97385e813164bb434829b1a155e88' 
  AND token = 'CrOaeZao7wYjbGApZar0Cu6E5TbIk7a8fufVfnyBzx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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