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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5ba545b73e4672e0d3731936f1e09a8858364115420e948b7d4188a0964aa8' 
  AND token = '6c+4jwvmawP117wkL9zbTOFq9VZWqrGlXa/UL0mS+IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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