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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aec70e991b28f6315c02d83ddc3231ba88f3b2fe67709b3d5e5b9437fe5832' 
  AND token = '44ojJ83oSrSIq7HRpLiRgNUHXLRtX7ogJJzmGDmH4Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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