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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4456374492fcaa88f386ed675ba05695ad1364e31dd2243ee79d94a20162ebd' 
  AND token = 'e8lelbB9H73610Tu5xx5vcbxlrAGC9gwHw9nRuaDsfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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