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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e70ad5909d1fbb19cd809175e6a963050166f6dea81bd0a69dff11c3b23b527' 
  AND token = 'TP2FsTrSsWeidowT3BZTkZctFxT22f+ofURBrmI/C7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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