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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53af27b05ac554433c0d98a5e3d24d76c225d8ec2f6940695e44fd78fa453d7' 
  AND token = 'r3XMKb1ujn2vTMaGwywqwT6eSt2s16kfdXACWFH0LWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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