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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f599b7712a882fc19e7e9550e6ec1bab1158786031ed9f8f7f088206601801aa' 
  AND token = 'iU/E+PxuiO1NxTtLZXM/hZX/SweX0ONMT4mnys24s2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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