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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4a1b3afe4e88566a11395c37d513c620c559bd061ec79ad9776342a8c4299a' 
  AND token = 'ZTi+epgLcl23p3IdB16+H6B06Z2A44Yvkyhvcn/jo1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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