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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadd1d790a8cb1a28692a0a60f7b8b63ade5421842265f544bc2c89526ffb95e' 
  AND token = 'KYcAt5Ps41vI2u2dhIMj4AYbGlKMvTPyAAULqj+PbbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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