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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a8b2b679f80dfb57d3c71f0d2dd359ba0c32acaf85d1e396572bcddfd1f693' 
  AND token = '9lSXxxy4xCmNrUXk1YptiMxeOCm/jJcnAwgdHD45N70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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