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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f8d97ee1a3bf5babfd00f1de2b0cb014b0ceea1b388eaeab032402443ba0a0' 
  AND token = 'oaYIM9GmTSLfL1VM9daIRvyG4gqjand8orp7eQhFErc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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