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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7410a25e1f7de60186d306840594416b291c454dc82798873c2a7013d3966f0' 
  AND token = 'K/UT34tH58KS04WrYJXsIb1hUzQdhoYVJfAnef+EK34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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