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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c7195d4ecce79dda12b7eb8c11a052045eeca928b2e909b736f0818f2b52e1' 
  AND token = '36qO0qjqB4sC2i6DTXqI+QUY3vZ/veaE2piclrQ8ke4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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