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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b764e6a68f73847cb29220d73be9ec76a9eb87cb81c29b715b8bf3c3cb61eb43' 
  AND token = 'VCOWyHHEUFBcCiO/f1bkueO0D23dHL6Eh3rcY9OHZdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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