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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797caa67e85826ce10cda5bb3a83001cc64fa480a15012093aeed155855e3d16' 
  AND token = 'jR4XexFukZ2okLLgYkqFqBkBTF2Vyt/+MVT0ac1njNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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