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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec73ba4e31ab12f22a5a33f4d19bdf1dbb9a3c57bb36f547698fda6eb604b00' 
  AND token = 'GebXf893RS2/2d395C+0laylAD/8/HguMZ1nIbURA3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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