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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9875d65c83909042d6c8b65ada20860ec9cab76db5c93ee90459c352aeb44a63' 
  AND token = 'cAMeYFqKCiIMkjnkympUCsF5kMvCadAEqHH4qI39d+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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