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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132788ee50b160ace0ef8994e9bc7f8e0eaffd1aa6943f68c46d25374e9ec98f' 
  AND token = 'GiZsHoQF5HnB2MsMmdT1ZPuLu5hkLhuXheGqbn2xEvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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