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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0af6f745bb4a2d42034f21d27232f90bc9423ff12dfb2d60ac3b78cb532b30' 
  AND token = 'x9NmlWnj8Ms6kpi1SfreZPccNAllPgM/ufKwXVMAXkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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