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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b6ef74efcd7a130f873bb15b387dcd484eb976ccf93f0fac39b22f99b034ff' 
  AND token = 'WKbRCl6kHOu4HHJHn9X5uprYyVqY63nngOBR8B7Xop0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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