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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1896f64c613a266af6c918ee869c0556f2e272b054da139f375e5dd745f9ee' 
  AND token = 'I7EsKT50LiPd0Tg/xjHjG836HesqlKVC1iy+fS/LXig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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