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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dddaf5d66ec72d379889a4208ac5c1dddaf9cbbe3739b59ac70c685cfd4d2aa9' 
  AND token = 'Oup3NG/FeFXoBDjNN967JRl7l4ZcxWFXLkIdOviygEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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