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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b082c5294791b9f8569c659d4d1cb36ee8f1f00bd17a0cd2befe44e8c2f74f6' 
  AND token = 'fvU4b32HS/4Ojuru5oVtWTUG0ntZapRIylC6+mKoIAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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