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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151225f9d45c8ac40c5e150b72b0a4847a30862c49bea4a1720363ff71bff108' 
  AND token = 'MBfzt4iD+hDFeGhj+nQTni/xmSc54a3aAkyV6RybLbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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