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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60c8a3576fb4cc52cfa8202c8a685f50cda63111cb57bb2eff1e2df32857c1c' 
  AND token = 'lABFek74jtZ/l9r2dsU4Q7k0eV4ngz2isp2Vcl6FcEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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