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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5113fd555345631d6433d927bc12978a0c674e1cedb367219ebb1af1ce7d715' 
  AND token = '7ljK/sNx9SuYbYiRkPnZ11mhKD7A9T7Mn3d/gehyJDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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